S-92620A879 3/4"-16 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with Grade 8 classification, ensuring reliable performance under high-stress conditions.
• Superior corrosion resistance provided by zinc yellow-chromate plating, extending service life in harsh industrial environments.
• Precise and secure fastening thanks to UNF fine threading and Class 2A fit, reducing the risk of loosening under vibration.
• Easy installation and removal with an external hex drive and standard 1 1/8" head width, compatible with common tools.
• High load-bearing capacity backed by 150,000 psi tensile strength and Rockwell C33 hardness for demanding applications.
• Full threading for maximum grip along the 5" length, providing consistent clamping force across the entire fastener.
• Compliance with industry standards including ASME B18.2.1 and SAE J429, ensuring quality and interchangeability.

Professional Applications & Engineering Value

This Grade 8 hex head screw is engineered to address critical challenges in heavy machinery, construction, and automotive assemblies where high tensile strength and vibration resistance are paramount. The UNF fine thread design enhances fatigue resistance and provides superior holding power compared to coarse threads, making it ideal for dynamic load conditions. The zinc yellow-chromate plating offers robust protection against corrosion, reducing maintenance needs in outdoor or chemically exposed settings. With a Class 2A thread fit, it ensures smooth assembly without compromising on precision, while the external hex drive allows for efficient torque application. These features collectively minimize downtime and enhance structural integrity in industrial applications such as equipment frames, engine components, and structural steel connections.

Specification Summary & Compliance

This fastener adheres to ASME B18.2.1 and SAE J429 specifications, guaranteeing dimensional accuracy and performance consistency. The 3/4"-16 UNF fine thread maintains a Class 2A fit per ANSI standards, ensuring proper engagement and tolerance. It is manufactured from high-strength steel with a zinc yellow-chromate finish for corrosion protection, and complies with industry regulations for mechanical properties, including 150,000 psi tensile strength and Rockwell C33 hardness. This product is suitable for use in regulated environments requiring reliable, high-performance hex head screws.